Hello,
Welcome to our forum and thanks for contacting us with your question!
You can find all available maps at the following link.
Map Collection
https://code.highcharts.com/mapdata/
If the map collection is not sufficient for you, then you should check this article:
https://www.highcharts.com/docs/maps/create-custom-maps
You can find there informations about creating your custom map and adjusting it to your needs.
Let me know if you have any further questions!
Regards!